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codes - help please.

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Old Apr 25, 2009 | 11:08 PM
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Default codes - help please.

98 C5

after a header install i got P0327 and P0332, knock sensor circuit front and rear, check engine light is on.

what is it ?

also, for a while i had a C1234 - left rear wheel speed circuit open or shorted - what part needs to be replaced ?


thanks guys !

- Konstantin

PS> car is running super rich right now if it makes any difference, 11.8 A/F. getting it fixed soon tho. Also, LR hub/bearing assy was replaced in 2004, 25k miles ago when C1223 and C1227 came on, just found old invoice from previous owner.

Last edited by Konstantin; Apr 25, 2009 at 11:22 PM.
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Old Apr 26, 2009 | 10:08 AM
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anybody ?
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Old Apr 27, 2009 | 07:19 AM
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Originally Posted by Konstantin
98 C5

after a header install i got P0327 and P0332, knock sensor circuit front and rear, check engine light is on.

what is it ?

also, for a while i had a C1234 - left rear wheel speed circuit open or shorted - what part needs to be replaced ?


thanks guys !

- Konstantin

PS> car is running super rich right now if it makes any difference, 11.8 A/F. getting it fixed soon tho. Also, LR hub/bearing assy was replaced in 2004, 25k miles ago when C1223 and C1227 came on, just found old invoice from previous owner.
Check with your installer tuner, did anyone do any intake mods? Car shouldn't be running rich if a proper tune was performed. Your fuel trimming is proabably off. Hopefully the codes for the fuel trims were not shut off.

Last edited by Arun@ChampionMotors; Apr 27, 2009 at 07:46 AM.
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Old Apr 27, 2009 | 04:54 PM
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no tune was done yet ( getting it done this wed, wanted before and after dyno ), i replaced the intake with 01+ intake, but that should not change anything. so, a tune can fix knock sensor codes ?

without a tune the car made 326rwhp/340rwtq running 11.8 AFR

thanks, you're right, i should just let my tuner take care of everything, instead of me trying to troubleshoot it, hes good at it.

- Kons
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Old Apr 27, 2009 | 05:24 PM
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Is the knock sensor harness plugged in? Also, it's possible that the harness was pinched under the intake manifold.
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Old Apr 28, 2009 | 12:43 AM
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Originally Posted by lucky131969
Is the knock sensor harness plugged in? Also, it's possible that the harness was pinched under the intake manifold.
light does not always come on, 50/50 chance while i drive... might have to take the intake off again.
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Old Apr 28, 2009 | 07:05 AM
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You had the intake off??
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Old Apr 29, 2009 | 11:30 AM
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Knock sensors are under the intake.
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